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The company makes computer-controlled sails that capture the sun's energy and also harness wind power.

New South Wales Minister for State Development Ian Macdonald says the sails can significantly reduce a ship's operating costs and emissions.

"The giant wings are as big as a 747s or an A380 [passenger airliners]. So they're very large," he said.

"They're covered in solar panels. They capture the sun's energy while harnessing the ocean wind. So it's very innovative technology and I look forward to seeing how they go with these two Cosco ships that they'll be building the appropriate sails on."